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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f10f8058ce2b90a831d4ca12d1c3bc0f70472448f3393bb28c4113716703c84' 
  AND token = '/nIs4h840tpfaFMMGg7R2PhwtzgitJBCNIZBjqDUmR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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