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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af02a863294fc2ee437aa22825ac7571e017e48159bc6a97720f8ad88494fc05' 
  AND token = 'dSH9jwt1wv14FHSZK+kF25KvdZ5gxatM4Yhs1Sv194A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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