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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7b34db41fe50542567fcde5e07d027b82177d45657c298b71a85b4cc311000' 
  AND token = '/68ybibs0T8mG5ByGfPENVqqR3mDDZEL4nJan1r4hCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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