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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632eb344ba1d46a60b8df7d5f37d3de840a9da137fdc4ef9bf82e321729f413b' 
  AND token = 'VL/NFe6b9QMpWZE9O9EikX7jB5rHjvI2wvxbSu/JMHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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