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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcb3048c7f4b52ee5a2694f5b2c6253655be1ef367085a3e0d40424fde77705' 
  AND token = 'TTNqHx3JYE4lMOc5ENBvVYCMk93dW7nsWp5Caet7NQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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