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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6d6bf408a36f6e9edd036816ea208dc84dce25796a3a5cfced3313c853267' 
  AND token = '0uSk3yEQ4ixxml7SP8j7e9GdRIj/3KHPRu/G4sbr1rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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