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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cc2765e98746603d7fa790b7635f23a12e8f56de8b11ed30311e14ee82bf12' 
  AND token = 'x7kCFBDTogS4260V2FLwC13RlTv7sSYW20jOn8fgNSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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