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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf25460a61da606174719f667c32a042858b44eb9f59d223a669b0b2cf0e90d0' 
  AND token = 'IdhDXRqM0b5/waiAXRHRXtwX4p7iAKpwkWf+4ptgqDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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