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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98346f9724dba4ac3fca5dc89b44d2390eddc75a7f0d4ab3f2e7554b130b5aab' 
  AND token = 'U2rKHhx9Xoc+87JBv5qk9bcugQ0lwMJgBytTOKzKgFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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