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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcb8e0e878e452686f8404abc66fe399d7be5069ddb365de17e5bc15ea63984' 
  AND token = 'mhC22u5rTxj5C6U6uperDFTs8EsgfKFktCGFXysoHTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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