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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2b6aa8cfd335da25f955d23551f0d387db244ce5190b070b701b5f67929e17' 
  AND token = 'RoWUENyw9QtHNIP2hh0/YkBSYVnQbmCTIVLvzNMcSKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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