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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f622dec6e71547ba5ceab0e3d1c820ed1486dfb597d26b6c1c8dc9192923eb1' 
  AND token = 'nz9RhoUmFByugG7lr6nKNIXFhzUjqt31DdgLM9Iv1oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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