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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c7bf7cb47791c17b8f7bd7c04787456bb7b03487d5c0832726f485dd7c25cb' 
  AND token = 'HBVQaNJNxVJdw9U9TQIQhNt9ov1CYtBodaEcgKk77+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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