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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e89bf70dda8a2344357c64227abfc7630840f2b82182e4a91f5e94bd31447e' 
  AND token = 'WxcFw8j24kBlZDgg6XKoO3P/Zp3Uu2rQrtgFhigPyDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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