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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9e5f7238cfe341e026cad9ac2a26431b7a80a417c73f57f65fe1e6db84d510' 
  AND token = '2TnKywiIGwfNVeMEqjRd49hZ4aOnGaVwL5yDLs+VGpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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