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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1039a13c5eaf941c2c9898f77a80a7884bc7c9c088f8c377d938be168d2896' 
  AND token = 'ihAKwQ8EG3skALNSYLeJvRfP4mPMhmK71Kn/8WwlbW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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