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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882d820b5a72fcf11cbe2842912efb7538201f5f0cd351129c16ac619b0b9785' 
  AND token = 'MARKAFSOcfMz8RWcDrc6QNYM3PnuyC5E3mkEdkaG1MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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