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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0060e73e0a916ad863da9c25625049a9fe011e52992448e8f439a13891c64b7f' 
  AND token = '878un8K7nH5gt2Fua55pqjlCcrjAZfsdf8zu9vHBlXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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