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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638c6f13cb7a11d766f4c1bf8968473aa4dd62b2032c36e78ad6018ff327b1c5' 
  AND token = 'GpHjxVDuvS7Di5cj0VUyZjJ2ZE0KUtKiMLT7/y7ts0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00213

JSON explain

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