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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86aca92b384140688bc25dc6f45d3a705cff545e52069eeb954e6887b3dbf8e' 
  AND token = 'wwrrg4OPzGG0l5cMAwa9HsAU7AyluxfhiSdxe1xVGOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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