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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d62e0fe64106dd57c1d5049e83ce21fda347df9597e7801d821b51989dc0ec7' 
  AND token = 'mbq/7cT3Fq+5QysHrQ5sfTofbdUHgo48SmABEJAXzJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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