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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ff5ba4ba2bacb2e9c0139d4c63d7abfa55594de3c997bd31432247385daa93' 
  AND token = 'SLomfWt9roxkbNRSGkXXPtEi8OO+nnH/sIHyic9zf/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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