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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04788d2cbd546ec4d4236fe45b7d177bcc5246b1e4aeffeb9ce5e11582c38f1c' 
  AND token = '+5dH89FA3uCLkFgfMD54nf2ETBv3Vd66esEvSt2xDBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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