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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f310c34c818d007e02c04bedfd6d49e31b84d9a7e8de1f6f71a482a7a79c9bb5' 
  AND token = 'x7uk4CG6Zc9oRvZUQ8QSmQITczJbiNrzGHKQghMXBWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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