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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c38a49cf8d0b005304fce16caeca036b1d22da48f44905aa6388d207ab96fce' 
  AND token = '/0bAvolbua8lNe/0bsjUdTvI9vVCV8XsHCbNt00Mo0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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