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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4dd1ed35212def7a4679e1844fddea6ecb74d2562b1d54f18d63a879f29b9e' 
  AND token = 'ctSfXtoGozbWKr7MaH7I0yque5pCLm+6DLvOr/pxy+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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