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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeae84ffb044f85ced77e567a09dfc5955428d1df125d01e8be4597072dcc94' 
  AND token = 'd0Q9WNXnAub1Az6OYey2YAfMhO+GpQibwUv9EWmuRkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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