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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93eee01598e12c437056fd37073b038e1149a6f3724a2537c926ff1563c2c621' 
  AND token = '/7/EhPmkUp4YeZ6RBEVvBBU0KJQw3I5g052A7qeZJwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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