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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a12f1310973055772ff7ec1615f980474f4caeedd75c14c9ee0976f7b7181a8' 
  AND token = 'xWJzEFULWQCndLF2ljE3khG2gF1wBOIQ5VRYh0w1FFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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