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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a87ed0aac3e7efe22e9472612a428bdf66d8a37495c7398ae418884b3e8342' 
  AND token = 'EsziZfF01MYprcznXFL83VUaPOMzY8Z78gmjvVVNlto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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