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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7a6d8e60ed517a3b582c554f27b6da3443dd361625a8e065cbef93ee470db6' 
  AND token = 'DMAXNngr9SC6TRvn1MJeri03GJHftS7HjvIzNBCbVCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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