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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c76f86980a13108ef2107a9faa92de084de0e9debc77bfb61d6e867f2710302' 
  AND token = 'caJwg2uJJiT/IY50hTKq9NMivKwPe0uChZ0u61MoQ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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