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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08e9b3eb04696c631aefbcd5333169f22f44a8bc8c8380eeec3401d324271be' 
  AND token = 'Acz95oEpTK2qVzr1DnUTYVqpD2L9jo8XAiDN9K7JedY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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