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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a22ea2651bb592f7d9ac12ddbc40d624b5882e89db6c6660df0cd92ce41b0ce' 
  AND token = 'mQw8nnbCK9OGflCar90nV6iGUrAEhdI0a5Sh3x8UAUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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