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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a925b8be252a1399400d89c85cbcbdcba6af559fc9da2078a13556101b5e5c' 
  AND token = 'lfBqGQyf1ngIckwhRakH5mX4AoW9sNkFsqWuF1XJA44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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