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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a0a8324207f9bffa79f79c6da78b6c6b4c5f2ca9c5349cfb240ee24768589a' 
  AND token = 'f+wnLZmolGWPpucdr5yNvvZJ3kFKoKt+zrTI1dR+idA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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