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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13a0fc3b329a1d34bede36694d32820cda3df577d6344ac448e0621d4aea121' 
  AND token = '+bg7QUu/XGSBw3w8M+2GFOQwPtk11Xw5S6CZJVaFdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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