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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea3ee3d6494ca4e0f026e46d774179b58fada32dee9f90e9cf3bed5a9fa428d' 
  AND token = '8F36IXczB6rP54ZOrrXHxR2Gc1p2xP0apeSspme5vbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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