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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d314730a5f9dedc0ce45cae052d32e1d23cc6a74630b3c051849540705f53f' 
  AND token = 'T8K0VINkRthdHi60C07UWDkPRogQoRphS1GjMdO8Fhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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