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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac16986e597a3f07eee25430f8c1a374a1010b44fb563f3104c6a5793b30264' 
  AND token = 'vmLPFYOV8sXUY4xylvE3zSrcxm1q7byGPs5pKsHZtJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}