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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef1a5b10043af1026c2632b8048b80fc2376f37e6da4e2a193fef1f720360e9' 
  AND token = 'c4LKmU42If8eaaGd6kObjgOBPdWnfrdSWicynyE+dQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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