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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a64d189b79dd7b85dfa121b673a6caab86115ff47b9aeb61276914d4dc650b' 
  AND token = 'u8cca1uvjTQhFjY7NW1wS7//M5ZMiyOxUoB4ECTvepQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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