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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb3995ee19f68f257427d25c34124509234f59540ef25e04193d0795078d6d8' 
  AND token = 'M/j9fFbOw6F3Nyue0QHiyGlH9dlZcR0d4ksaqvdk9SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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