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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54b3a906ad2168d1c9a9c9c1ed4718b3bea3011bb9b63701ca6efa70e171591' 
  AND token = 'kHIsljHOPbvQZT6pommH4e+ra8isgfyMcb/2vISGlkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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