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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad3b0bdf7af2d863210630e23cf282d2e7f4a8b5ef856636f4f99d6fb422311' 
  AND token = 'y+dIdx8sy7O6S/TgfC2qGvgM2xFAVLYMricn6NNWsmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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