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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bf8b1e9e9581cd83a8bb9f7e83214f6b7fa4e2e74875b7a96973d5e5955020' 
  AND token = 'khQgEoV7XNKl/pWIx4KVhR9XeiMTszAhf4FriZ2w2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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