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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63603fe6906ce6496e31c47f510168aa6a32bffc33919dec3f5b79149ef6fdf' 
  AND token = '7YgF3j5f2fx+0CoCuGMOKS39o2T0T51UDMSEYdhX5mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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