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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae77d9e179043b9fcc0f6f52763bbe9c0391439edfc04a83c4576a0455c9b3a' 
  AND token = 'mmh2c4HqC5It2azy+4Q07ENbJISDgCL1SCvCiFJAkwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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