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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb1151728f3a1ccedfd6baeb478d2d7b55dc4f41ce6cfb713879d550bcf7e98' 
  AND token = 'OqFpH7Y4Xk/wnASQotMC+B8UF6KjtMZDswtr4gfqao4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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