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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6e456be73ba2a7914d8882a75f0ad9d6d599acfd50fb59b7eea2d70f4d379c' 
  AND token = 'qbOwm4HefEEzuykEABz9y93yWYbZ67fx+CaD9vBHIPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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