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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554a0ef55877b0eff53445d2c3831082b7d030335bb94d4b40d8756cbc71150e' 
  AND token = 'Lg+KSzlI/QvR1GRjlkXQObMzPXEb2GNfxp+EiZ7Pbuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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