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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95250d97020d4bab4318e36cfb968e253ab32a0a9b0a7361ab2bd071fe801d30' 
  AND token = 'XwaRuCUeOEUVUDxnHQDucui1K2pjDdBFa/WlYwUHfCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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