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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c629b7453434584d148ef68040118dbb5bea6b4d4432b63e2381c0c1fd5b4e1' 
  AND token = 'ta6MPA1mEOBaw+5lm8cVeZuEUQocnY4w66RX3QItZwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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