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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7487465f2a1f64c7d3a853d3d3fe38b74b9ed13c8cf5cd8f5aa2d4472a84de29' 
  AND token = 'gvl2VWjvPAgEuwulMfURjDtQmk4ae7yawZL/dgh9FgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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