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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328694ae5d47eff35a075b272929bd7fc2890276c79a49e57a715b678a86552b' 
  AND token = '5SXPo8M2eC2vb46DKCQUUG2D8ftpEacEy1pMsvMMMu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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