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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6312b938b6694aaecc79a61d3c0b5dfdb3bf5d8621c6d884a5204c95e255202f' 
  AND token = 'FZFOBLFjV10vq0dT5mLg4FoROekpg2c0mTjMmaIxCIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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