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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c2613c39bbc4e6bb083465148995630cfe6818a5ce3a5af1fe797630d20c47' 
  AND token = '4Wd0gLjAyLefu4UFfL1oJYTKaJbHhFSpb/ADXnPjpuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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