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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6002a6ceea4451d285a0fbba021a68450cca4849f1ee5a0be00b6696cd1d038' 
  AND token = '4eOpIqnYMnPTf+ZtGL0E96obSTBbBZs18/uGoF7evC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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