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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0291c3cd865bf29d73938766af214b79de3d87cc120de79f16c5f096e64dca' 
  AND token = 'Uh2dajc/NgC/v2MXWdwKoc1uwrtp3//rd73pkA8jVss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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