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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2710fafb86c3f4043a07213b6b565a66ecc1370299ef6ee2ec186c0b5f4d153c' 
  AND token = 'zBfxA2PtmMsFVBr65IJ6BEwjW2jDozy1LJ6vDTJBehQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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