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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05b0045657ffdbc4f440f02a4fd2038028f56e978d6926705abf823c5ef84ee' 
  AND token = '1aV8D412JrfA7i4OcDP1SrzPv8fb7sCCNV98kx6AMNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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